BHG has this really simple but very effective flower arrangement idea. All you need is a clear glass pitcher, a tall glass, some lemon slices and flowers.
First, slip the glass inside the pitcher.
Then slice lemons into 1/4" slices and arrange them between the glass and the pitcher. Of course, you'll start at the bottom and then overlap the slices a bit as you go.
Finally, gently pour water over the lemon slices and into the glass and add flowers. (At Christmas time, you could substitute fresh cranberries in place of the lemon slices!)
For more flower arranging ideas, visit BHG.